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My Rena Air 100 is geared for up to 20 gallons. I tried it in my 40 gallon just to see if it would work or not and quite frankly it works justs as well and produces as many bubbles as in my smaller tank. I have yet to hear any noise coming from it...it's extremely quiet. It does its job very well.

------------------------------You can't play nice with people who don't play by the rules!

This is a quiet yet powerful air pump. It is more expensive than the competition but I have yet to have one of these stop working despite constant use over more than a year. Look around to find your best price and you won't be disappointed with the purchase.

I have been very pleased with Rena products recently purchased, so I decided to go for the Rena Air rated for up to 160 gallons for my 125. The amount of bubbles given out is fair, but I may have messed up the air output.
I like that it came with an airstone as well as tubing.
It is rather quiet.

I bought the Rena 300 air pump along with a Rena XP3 canister filter for my 60 gallon tank. This air pump is super quiet. I cant hear it at all unless I open the door to the cabinet that it is sitting in, and even then it is very quiet. So far I am very happy with the Rena products I have purchased.

------------------------------You can never have too many wheelbarrows.

Air pump has been in use for over 8 years on two different tanks and I have not had one problem with it. I have the 400 and it is very powerful- easily handling anything I throw at it. The 400 has 2 direct adjustable outlets and also work very well.